Adaptive multiuser detection
- 17 December 2002
- proceedings article
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
The development of multiuser detection has proceeded along a path which is typical of other areas in communicaiions. Initially, optimum solutions were obtained along with the best possible performance achtev- able in Gaussian noise channels (I). Those results showed a huge gap between the optimum performance and the performance of the conven- tional single-user detector (which neglects the presence of multiaccess interference). In particular. they showed that the near-far problem is not a flaw of CDMA. as widely beheved, but of the inability of the conven- tional receiver to exploit the suucmre of the multiaccess interference. This feature of multiuser detection sidesteps the need for sophisticated high-precision power conuol in mobile communication systems. Thus, an increase in the complexity of the base station enables a considerable reduction in the complexity of the mobile transmitters. Equally impor- tant to the near-far resistant property of optimum multiuser detection, is the performance gain that it promises even in situations of exact power control (equal-power reception). This performance gain results in lower power consumpuon and processing gain requirements, which translate into increased battery lifes and lower bandwidth in order to support the same information rates. The second stage in the development of multiuser detection wasKeywords
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